Google Glass for sale, but for how long?

MOUNTAIN VIEW -- The one-day window to buy your own Google Glass opened Tuesday morning at 6 a.m., but Google has not said how many are up for sale -- or how long the sale will last.

Until Tuesday, an estimated 10,000 units have only been in the hands of people hand-selected by Google, dubbed Explorers. While many are curious about the capabilities of Google Glass, some of the early adopters have reported angry confrontations over the wearable technology's ability to surreptitiously record and shoot images and instantly upload them to the Internet.

Google has said it hopes to bring Google Glass to the mass consumer market sometime later this year. So it's unclear what Google's trying to accomplish by offering an unspecified number of units for a limited time -- for a cool $1,500 each.

The company did not respond to requests for comment Monday but posted on Google+ that "Our (Google Glass) Explorers are moms, artists, surgeons, rockers, and each new Explorer has brought a new perspective that is making Glass better. But every day we get requests from those of you who haven't found a way into the program yet, and we want your feedback, too. So in typical Explorer Program fashion, we're trying something new."